diff options
| author | Max Filippov <jcmvbkbc@gmail.com> | 2015-09-16 01:49:49 +0300 |
|---|---|---|
| committer | Waldemar Brodkorb <wbx@openadk.org> | 2015-10-08 20:31:24 +0200 |
| commit | e78a0f58f23347c822c182d1c01f6eb9b9866d60 (patch) | |
| tree | 723cfbcd2411d889fb4956adb7f2d11a6d766050 /libc/string/xtensa/strcpy.S | |
| parent | 9fae2ad9937279c9f7f40975ac14cb7b57f4a36d (diff) | |
xtensa: support call0 ABI
Most changes are mechanical replacement of 'retw' instruction with
'abi_ret' macro, defined to 'retw' or 'ret' according to ABI.
Assembly code that makes calls is duplicated for call0 ABI with changed
register numbers for parameters/return value and call instruction.
'entry' instructions are replaced with 'abi_entry' macro.
More interesting changes:
- non-leaf assembly functions (e.g. _dl_tlsdesc_dynamic,
_dl_linux_resolve, SYSCALL_ERROR_HANDLER, PSEUDO) now need to preserve
registers around intermediate calls they make, use temporary stack
frame for that;
- setjmp/longjmp only need to save and restore return address, stack
pointer and callee-saved registers in the jmpbuf;
- __clone and syscall functions had hardcoded offsets to parameter
passed on stack, on call0 ABI they don't need stack frame, so the
offset is different. Replace these offsets with FRAMESIZE macro.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'libc/string/xtensa/strcpy.S')
| -rw-r--r-- | libc/string/xtensa/strcpy.S | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/libc/string/xtensa/strcpy.S b/libc/string/xtensa/strcpy.S index f9f586896..9f42b34e6 100644 --- a/libc/string/xtensa/strcpy.S +++ b/libc/string/xtensa/strcpy.S @@ -68,7 +68,7 @@ ENTRY (strcpy) s8i a8, a10, 1 /* store byte 0 */ addi a10, a10, 2 /* advance dst pointer */ bnez a8, .Lsrcaligned -1: retw +1: abi_ret /* dst is word-aligned; src is word-aligned. */ @@ -102,21 +102,21 @@ ENTRY (strcpy) #endif /* !XCHAL_HAVE_LOOPS */ .Lz3: /* Byte 3 is zero. */ - retw + abi_ret .Lz0: /* Byte 0 is zero. */ #ifdef __XTENSA_EB__ movi a8, 0 #endif s8i a8, a10, 0 - retw + abi_ret .Lz1: /* Byte 1 is zero. */ #ifdef __XTENSA_EB__ extui a8, a8, 16, 16 #endif s16i a8, a10, 0 - retw + abi_ret .Lz2: /* Byte 2 is zero. */ #ifdef __XTENSA_EB__ @@ -125,7 +125,7 @@ ENTRY (strcpy) s16i a8, a10, 0 movi a8, 0 s8i a8, a10, 2 - retw + abi_ret .align 4 /* (2 mod 4) alignment for loop instruction */ @@ -144,6 +144,6 @@ ENTRY (strcpy) #else bnez a8, 1b #endif -2: retw +2: abi_ret libc_hidden_def (strcpy) |